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Exchange server need help

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I have exchange 5.5 with service pak 4, What i cant figure out is why some most emails sent go out ok but sometimes i get back a message that says "The following recipient could not be reached unable to deliver the message due to a communications failure"

what is happening here?

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by timwalsh

This is usually not a concern unless you start seeing this a lot. Many things have to work correctly to successfully pass an email message from one location to another.

All this error message is saying is that at the time the server attempted topass this email, there was a communication problem. This problem could have been a momentary glitch on your server. It could have been a momentary glitch with your Internet connection. It could have been a momentary glitch with the email server at the far end. Glitches happen!

This is a situation that bears watching (for patterns such as: always at the same time of day, always with the same destination, etc.), but the situation doesn't warrant any panic or MAJOR concern as of yet. Any patterns found may help you determine what the cause might be.

Hope this helps.

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